CN103046232B - Stretchable bulky nonwoven fabric and its manufacturing method - Google Patents

Stretchable bulky nonwoven fabric and its manufacturing method Download PDF

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Publication number
CN103046232B
CN103046232B CN201210387853.6A CN201210387853A CN103046232B CN 103046232 B CN103046232 B CN 103046232B CN 201210387853 A CN201210387853 A CN 201210387853A CN 103046232 B CN103046232 B CN 103046232B
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China
Prior art keywords
fibrous layer
fiber
contained
woven fabrics
layer
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CN201210387853.6A
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Chinese (zh)
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CN103046232A (en
Inventor
寺田博和
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JNC Corp
JNC Fibers Corp
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JNC Corp
JNC Fibers Corp
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
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    • B32B5/022—Non-woven fabric
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention provides a kind of Stretchable bulky nonwoven fabric and its manufacturing method.The Stretchable bulky nonwoven fabric, the first fibrous layer comprising the first fiber is laminated with the second fibrous layer comprising fusible second fiber of heat and with the MD shrinking percentages lower by more than 5% than the MD shrinking percentages of first fibrous layer, first fibrous layer and second fibrous layer are by first fiber being contained in first fibrous layer and the entanglement being contained between second fiber in second fibrous layer and integrated, first fibrous layer shrinks to form the structure that the second layer swells in a thickness direction, and apply sound wave bonding processing from the second fibrous layer side.

Description

Stretchable bulky nonwoven fabric and its manufacturing method
Technical field
The present invention relates to a kind of Stretchable bulky nonwoven fabric and its manufacturing methods.
Background technology
It is known by melt-blown process to elastomer resin carry out spinning, by the fiber stack obtained by spinning in conveyer On, and make to bond between fiber subsequently, by means of heating roller and obtain thin slice, as the technology (example for obtaining flexible nonwoven fabrics Such as, referring to patent document the 1st).
It is also known that Three-dimensional sheet materials etc., wherein comprising 30 mass % or more than 30 mass % 3-D crimped fibers One fibrous layer is laminated with the second fibrous layer comprising the 3-D crimped fiber with the identical or different class of fiber in the first fibrous layer, Two fibrous layers will be bonded partly, and the first fibrous layer exists in the form of integrated stick portion in a thickness direction by many It is protruded between corresponding stick portion and many ridges (for example, referring to patent document the 2nd) is formed on the first fibrous layer side.
Reference listing
Patent document
Patent document the 1st：JP 2009-256856A.
Patent document the 2nd：JP 2004-202890A.
Invention content
Technical problem
However, the thin slice described in patent document the 1st has extremely low fluffy degree.Therefore, thin slice has bad gas permeability With impaired tactile.Thin slice also has the undesirable appearance smoothness (surface caused by the distinctive friction of elastomer resin used in wherein Smoothness) problem.
In addition, sheeting described in patent document the 2nd is by partly bonding the floor of both advance hot paddings, And then make the section between stick portion prominent and preparation by being heat-shrinked the second fibrous layer.Therefore, have very high fluffy The non-woven fabrics of looseness is quite difficult to be obtained.
Therefore, it is an object of the present invention to provide with the Stretchable bulky nonwoven fabric compared with high-loft and good tactile.
More specifically, the present invention relates to Stretchable bulky nonwoven fabric, wherein the first fibrous layer comprising the first fiber with Comprising fusible second fiber of heat and with lower by more than 5% than the MD shrinking percentages (shrinkage ratio) of the first fibrous layer The second fibrous layer lamination of MD shrinking percentages, the first fibrous layer and the second fibrous layer are fine by be contained in the first fibrous layer first Tie up the entanglement between the second fiber being contained in the second fibrous layer and integrated, the first fibrous layer shrinks have wherein the The structure and sound wave bonding processing (sonic is partly applied from the second fibrous layer side that two fibrous layers swell in a thickness direction bond processing)。
The invention further relates to manufacture Stretchable bulky nonwoven fabric method, including：By the first fiber comprising the first fiber Layer and second comprising fusible second fiber of heat and with the MD shrinking percentage lower by more than 5% than the MD shrinking percentages of the first fibrous layer Fibrous layer is laminated；By between the first fiber being contained in the first fibrous layer and the second fiber being contained in the second fibrous layer Entanglement and integrated first fibrous layer and the second fibrous layer；The first fibrous layer is made to shrink to form the second fibrous layer in thickness side The structure swelled upwards；And sound wave bonding processing is partly applied from the second fibrous layer side.
Way to solve the problem
Present inventor assiduously continues to study solving described problem, consequently found that, have compared with high-loft and good The Stretchable bulky nonwoven fabric of good tactile can be by that will include the first fibrous layer of the first fiber and comprising fusible second fibre of heat Dimension and with less than the first fibrous layer MD shrinking percentages MD shrinking percentages the second fibrous layer lamination and using working process And it obtains, therefore the present invention is completed based on the discovery.
The present invention has construction as described below.
[1] a kind of Stretchable bulky nonwoven fabric, wherein the first fibrous layer comprising the first fiber is with including heat fusible second Fiber and the second fibrous layer lamination with the MD shrinking percentage lower by more than 5% than the MD shrinking percentages of the first fibrous layer, first is fine Dimension layer and the second fibrous layer pass through the first fiber being contained in the first fibrous layer and the second fibre being contained in the second fibrous layer Entanglement between dimension and it is integrated, the first fibrous layer is shunk to form the structure that the second fibrous layer swells in a thickness direction, with And sound wave bonding processing is partly applied from the second fibrous layer side.
[2] according to the Stretchable bulky nonwoven fabric of [1], wherein the first fiber being contained in the first fibrous layer is with being contained in Interface of second fiber on the thickness direction of non-woven fabrics between the first fibrous layer and the second fibrous layer in second fibrous layer Place partly tangles.
[3] according to the Stretchable bulky nonwoven fabric of [1] or [2], comprising by sound wave bonding process formed recess portion with And the protrusion that the position by not being subjected to sound wave bonding processing is formed.
[4] according to the Stretchable bulky nonwoven fabric of [3], wherein the thickness of protrusion is in the range of 1.0 millimeters to 5.0 millimeters.
[5] according to the Stretchable bulky nonwoven fabric of [3] or [4], there is the position institute for the thickness that recess portion is formed by removal The hole of acquisition.
[6] a kind of method for manufacturing Stretchable bulky nonwoven fabric, including：By the first fibrous layer comprising the first fiber and packet The second fibrous layer containing fusible second fiber of heat and with the MD shrinking percentage lower by more than 5% than the MD shrinking percentages of the first fibrous layer Lamination；Pass through the entanglement between the first fiber being contained in the first fibrous layer and the second fiber being contained in the second fibrous layer And integrated first fibrous layer and the second fibrous layer；Shrink the first fibrous layer grand in a thickness direction to form the second fibrous layer The structure risen；And sound wave bonding processing is partly applied from the second fibrous layer side.
The advantageous effect of invention
Non-woven fabrics according to the present invention has splendid retractility and simultaneously compared with high-loft, and what is formed on non-woven fabrics is recessed Convex and also splendid tactile.
Specific embodiment
In the present invention, " MD " is the abbreviation of machine direction (Machine Direction) and means that non-woven fabrics is given birth to The direction of producing line.In addition, " CD " is the laterally abbreviation of (Cross Direction) and means perpendicular to the side of machine direction To.
In the present invention, " MD shrinking percentages " means such as by being prepared from fiber with 100 grams/m of (g/m2) list The fabric (web) and fabric of position weight in an oven at 120 DEG C through during heat-treated 5 minutes because caused by showing and crimping The ratio shunk on MD.
The present invention provides Stretchable bulky nonwoven fabric, wherein the first fibrous layer comprising the first fiber is with including heat fusible the Two fibers and the second fibrous layer lamination with the MD shrinking percentage lower by more than 5% than the MD shrinking percentages of the first fibrous layer, first Fibrous layer and the second fibrous layer pass through the first fiber for being contained in the first fibrous layer and be contained in the second fibrous layer second Entanglement between fiber and it is integrated, the first fibrous layer is shunk to form the structure that the second fibrous layer swells in a thickness direction, And sound wave bonding processing is partly applied from the second fibrous layer side.
First fibrous layer
The first fiber being contained in the first fibrous layer preferably shows the high shrinkage caused by showing curling, and And cause to be bonded to each other when there is no fiber because the heat fusion of fiber in the contraction process for using heating processing machine etc..
The MD shrinking percentages of first fiber are preferably 40% or more than 40%, and more preferably 50% or more than 50%, more preferably It is 65% or more than 65%.
If MD shrinking percentages are 40% or more than 40%, then can be filled to the coarse flexible nonwoven fabrics offer finally obtained Divide retractility, and easily generate abundant protrusion.In addition, the first fiber does not glue each other under the contraction processing temperature of the first fiber It closes.
Even if the first fiber is potential rollable conjugate fiber (conjugate fiber), and initially shows higher receipts Shrinkage, when being bonded to each other fiber simultaneously, fiber is fixed also by bonding.Therefore, movement, the i.e. exhibition of latent crimp are shunk It is now adversely affected, and abundant contraction cannot be obtained.Therefore, the retractility of the first fibrous layer becomes smaller.In addition, fiber It is fixed to one another.Therefore, it is needed after flexible etc. action compared with high tension, it is thus impossible to obtain compared with high scalability energy and tactile Decline.
The particular instance of first fiber includes parallel type conjugate fiber (side-by-side type conjugate ) or eccentric sheath core pattern conjugate fiber (eccentric sheath-core type conjugate fiber) fiber.
For parallel type conjugate fiber, it is preferable to use polypropylene or polyester are as high melting point component.In addition, as low melting point Component is, it is preferable to use include the resin of such as following this copolymer：Ethylene-propylene bipolymer, -1 binary of propene-1-butene are total to Polymers, -1 bipolymer of -1 terpolymer of ene-propylene-butene, -1 bipolymer of butene-hexene or propylene-octene Or the mixture of the copolymer.
For eccentric sheath core pattern conjugate fiber, using low-melting component preferably on sheath side, and preferably make on core side Use high melting point component.
In view of thermal contraction at low temperature and cost, ethylene-propylene bipolymer preferably has 4 mass % to 10 matter Measure the ethylene contents in the range of % and the propylene content in the range of 90 mass % to 96 mass %.In addition, ene-propylene-butene- 1 terpolymer preferably has ethylene contents in the range of 1 mass % to 7 mass %, in the range of 88 mass % to 98 mass % Propylene content and 1 mass % to 5 mass % in the range of 1- butene contents.
The fusing point of the low-melting component of first fiber is preferably in the range of 128 DEG C to 160 DEG C, more preferably at 130 DEG C to 150 In the range of DEG C.If fusing point is 128 DEG C or higher than 128 DEG C, then the resin on low-melting component side is less than the first fiber It shrinks and is not melted, therefore be not in the reduction of the telescopicing performance caused by fiber is bonded to each other under processing temperature.
In view of spinnability and machinability, the melt mass flow rate of low-melting component is { in JIS K7210 (1999) In experimental condition M under the value that measures preferably in the range of 0.1 gram/10 minutes to 80 grams/10 minutes, more preferably 3 grams/10 In the range of minute to 40 grams/10 minutes.
As high melting point component, crystalline polypropylene can be utilized, such as Noblen or propylene and a small amount of, usual 2 matter Measure % or ethylene or the copolymer of alpha-olefin less than 2 mass %.The particular instance of this crystalline polypropylene is included using general The crystallization poly- third that purposes Ziegler-Natta catalyst (Ziegler-Natta catalyst) or metallocene catalyst are obtained Alkene.
The fusing point of high melting point component is preferably in the range of 150 DEG C to 165 DEG C, more preferably in the range of 155 DEG C to 160 DEG C. If fusing point is 150 DEG C or higher than 150 DEG C, then it is poor with the fusing point of the fusing point of low-melting component to substantially ensure, therefore, becomes Obtaining may select to shrink the processing temperature during processing from wide temperature.
In view of spinnability and machinability, the melt mass flow rate of high melting point component is { in JIS K7210 (1999) In experimental condition M under the value that measures preferably in the range of 0.1 gram/10 minutes to 80 grams/10 minutes, more preferably 3 grams/10 In the range of minute to 40 grams/10 minutes.
Polyester can be used poor with the fusing point of the fusing point of low-melting component further to expand as high melting point component.Polyester Particular instance include polyethylene terephthalate, polybutylene terephthalate or ethylene terephthalate with to benzene two The copolymer of formic acid fourth diester.
The fineness (fineness) of first fiber is preferably in the range of 1.0 dtexs (dtex) to 20 dtexs, more preferably 1.5 In the range of dtex to 10 dtexs, more preferably 2.2 dtexs to 7.0 dtexs.If fineness is 1.0 dtexs or more than 1.0 dtexs, that For example when the first fiber undergoes condensation process, will not both generate cotton knot will not upset texture, will not reduce processing speed Degree.If fineness is 20 dtexs or less than 20 dtexs, then the curling of the first fiber is satisfactorily maintained to show property, and It is easy to get 40% or the shrinking percentage more than 40%.
The fineness of fiber can be for example by measuring fibre diameter by means of electron microscope or light microscope and using It is surveyed for measuring the density gradient column of density or balance measurement fibre density and then calculating fineness according to below equation It is fixed：{ diameter (micron) }24 × π of ÷ × { density (gram/cc) } ÷ 100={ fineness (dtex) }.Fineness can also use JIS L0104 (2000) are measured by calculating fineness according to below equation：10,000 × { fibre weight under L (rice) } ÷ L (rice)={ fineness (dtex) }.The fineness of fiber can the method according to known to as described above disclosing so far measure.
In addition, the effective fibre length of the first fiber is preferably in the range of 10 millimeters to 150 millimeters, more preferably at 25 millimeters To in the range of 65 millimeters.When the effective fibre length of the first fiber is more than 150 millimeters, cotton knot and line are generated in condensation machine Reason is reduced.When the effective fibre length of the first fiber is less than 10 millimeters, fiber comes off in carding process from fibrous layer, therefore Reducing of the productivity.
" effective fibre length (Actual fiber length of the fibers) of fiber " means crimped fibre Physical length, and be equivalent to when not to fiber apply stress in the case of stretch curling when length.The reality of fiber Fibre length (can have the microscope of image analysis function, such as by Keyemce by the equipment by means of that can buy on the market The digital microscope of company (KEYENCE Corporation) manufacture) passing through along fiber measures a fiber And it measures.
However, if ratio is in the range of it can maintain shrinking percentage, then can mix and using fineness beyond as above Other collapsible fibers of the text fineness range.Furthermore, it is possible to by the fiber in addition to the first fiber not significantly, adversely It influences to be mixed into the first fibrous layer in the range of the advantageous effect of the present invention.
First fiber can be such as according to spun-bond process (spunbond method) or meltblown (meltblown method) The staple fiber or long fibre of acquisition.In the case of staple fiber, fibre length is not particularly limited, it is preferred that being arrived at 20 millimeters In the range of 100 millimeters.
Show the temperature of the first fibrous layer maximum contraction rate preferably in the range of 135 DEG C to 160 DEG C.
Although preferred range depends on forming the diameter of fiber, the Unit Weight of the first fibrous layer preferably 5 grams/it is flat Square rice is in the range of 50 grams/m, more preferably in the range of 10 grams/m to 30 grams/m.
Second fibrous layer
Second fibrous layer includes fusible second fiber of heat.The preferred displaying of second fiber that heat is fusible, which is less than, is contained in the first fiber The MD shrinking percentage values of the MD shrinking percentage values of the first fiber in layer.
However, if ratio is in the range of the intensity for not reducing the second fibrous layer, then can mix and using not Thermal bondable fiber (as starched).When thermal bondable fiber is not mixed into the second fibrous layer, thermal bondable fiber is not based on total The ratio of second fibrous layer is preferably in the range of 10 mass % to 80 mass %, more preferably in 30 mass % to 70 mass % ranges It is interior.
The MD shrinking percentages of fusible second fiber of heat are preferably 35% or less than 35%, and more preferably 25% or less than 25%.
If MD shrinking percentages are 35% or less than 35%, then can significantly ensure the first fibrous layer and the second fibrous layer it Between contraction it is poor.Therefore, convex ridge is easily formed during shrink process.In the present invention, specifically, have 5% or the MD shrinking percentages less than 5% fusible second fiber of heat be known as can not high shrinkage 2B, and with the MD more than 5% Fusible second fiber of heat of shrinking percentage is known as fiber 2A.
As fusible second fiber of heat, the conjugate fiber comprising the first component and the second component can be utilized, wherein second Fusing point of the component for example with the fusing point less than the first component or with the softening point less than the first component softening point.As group The combining form of condensating fiber can utilize parallel type, eccentric sheath core pattern or concentric sheath core pattern conjugate fiber (concentric sheath-core type conjugate fiber).In parallel type conjugate fiber, the first component and the second component are both At least part fiber surface is formed in the longitudinal direction.In eccentric sheath core pattern conjugate fiber, the second component forms sheath component, And the first component forms core component, and sheath component is prejudicially arranged with core component.In concentric sheath core pattern conjugate fiber, the Two components form sheath component, and the first component forms core component, and sheath component is concentrically arranged with core component.As first Component can use polypropylene or polyester.As the second component, can use selected from low density polyethylene (LDPE) (LDPE), linear low At least one of density polyethylene (LLDPE) and thermoplastic elastomer (TPE).
The fineness of hot fusible second fiber is preferably in the range of 1.0 dtexs to 20 dtexs, more preferably in 1.5 dtexs to 10 points In special range, more preferably 2.2 dtexs to 7.0 dtexs.
If can not high shrinkage 2B with thermomeltable matter and never collapsible fiber 2B prepare have 100 grams/put down The fabric and fabric of the Unit Weight of square rice are in 120 DEG C of baking ovens through having the MD of substantial 0 (zero) during heat-treated 5 minutes Shrinking percentage, then can not high shrinkage 2B can be the homofil comprising polyolefin or polyester.
The particular instance of thermoplastic elastomer (TPE) includes the elastomer (styrene-based of the styrene-based of hydrogenation Elastomer, SEBS) or thermoplastic polyurethanes (thermoplastic polyurethane, TPU).In view of phase Capacitive is, it is preferable to use the elastomer based on alkene.
The particular instance of elastomer based on alkene includes ethylene-propylene rubber (ethylene-propylene Rubber, EPR), ethylene-propylene-non-combined diene copolymer rubber (ethylene-propylene-non-conjugated Diene copolymer rubber, EPDM) or -1 copolymer of ethylene-octene (by Dow Chemical (The Dow Chemical Company) manufacture Engage 8402).
A kind of thermoplastic elastomer (TPE) or two kinds or the mixture more than two kinds of thermoplastic elastomer (TPE)s, and elasticity can be used Body can also mix and use with LDPE or LLDPE.Furthermore, it is possible in the model for the advantageous effect that can not adversely influence the present invention Any other resin or additive (such as slip agent) or the inorganic substances for including pigment, calcium carbonate or titanium oxide are included in enclosing.
When fusible second fiber of heat is conjugate fiber, heat is fusible, and second fiber has by second group of combination partner form Thermomeltable energy caused by the heat fusion divided or softening.
Specifically, if by thermoplastic elastomer (TPE) for the fiber in the second fibrous layer, then the bonding between fiber It is further enhanced by the viscous effect of thermoplastic elastomer (TPE), and at the same time the bounding point after bonding shows caoutchouc elasticity in itself Behavior.It is therefore preferred that the retractility of improvement non-woven fabrics.
The fusing point or softening point of second component are preferably in the range of 70 DEG C to 130 DEG C, more preferably in 95 DEG C to 125 DEG C ranges It is interior.If fusing point or softening point are 70 DEG C or higher than 70 DEG C, then will not both be generated because of gold in the carding process for preparing fabric Belong to silk combs caused cotton knot (fibre fusion) of friction etc., will not upset texture.In addition, if fusing point or softening point are 130 DEG C or less than 130 DEG C, then do not melted in low-melting component side for the first fiber of the first fibrous layer, and fiber that This is not bonded.Therefore, tactile is soft and can keep retractility.
In the present invention, it is contemplated that shrink and tactile, the fusing point of hot fusible second fiber are preferably shorter than the molten of the first fiber Point.Specifically, the fusing point for forming fusible second fiber of heat and the component with the minimum fusing point in the second fiber preferably compares The fusing point for forming the first fiber and the component with the minimum fusing point in the first fiber is 5 DEG C to 50 DEG C low, more preferably low 15 DEG C To 35 DEG C.
In view of spinnability and machinability, the melt mass flow rate of hot fusible second fiber is { in JIS K7210 (1999) value measured under the experimental condition M in } preferably in the range of 0.1 gram/10 minutes to 80 grams/10 minutes, more preferably 3 Gram/10 minutes to 40 grams/10 minutes in the range of.
As the first component of fusible second fiber of heat, crystalline polypropylene can be utilized, as Noblen or propylene with On a small quantity, usual 2 mass % or ethylene or the copolymer of alpha-olefin less than 2 mass %.The particular instance of this crystalline polypropylene It is obtained comprising general service Ziegler-Natta catalyst (Ziegler-Natta catalyst) or metallocene catalyst is used Crystalline polypropylene.
The fusing point of first component is preferably in the range of 150 DEG C to 165 DEG C, more preferably 155 DEG C to 160 DEG C.If fusing point It it is 150 DEG C or higher than 150 DEG C, then it is poor with the fusing point of the fusing point of the second component to substantially ensure, and during shrinking processing Processing temperature range increase.
In view of spinnability and machinability, the melt mass flow rate of the first component is { in JIS K7210 (1999) Experimental condition M under the value that measures preferably in the range of 0.1 gram/10 minutes to 80 grams/10 minutes, more preferably at 3 grams/10 points Clock is in the range of 40 grams/10 minutes.
It is poor with the fusing point of the second component fusing point in order to further expand, polyester can be used as the first component.Polyester Particular instance includes polyethylene terephthalate, polybutylene terephthalate or ethylene terephthalate and terephthaldehyde The copolymer of sour fourth diester.
Heat is fusible, and second fiber can be the staple fiber or long fibre such as obtained according to spun-bond process or meltblown.In staple fiber In the case of, effective fibre length is not particularly limited, it is preferred that in the range of 20 millimeters to 100 millimeters.
Although preferred range depends on forming the diameter of fiber, the Unit Weight of the second fibrous layer preferably 7 grams/it is flat Square rice is in the range of 50 grams/m, more preferably in the range of 10 grams/m to 30 grams/m.
Manufacturing method
The Stretchable bulky nonwoven fabric of the present invention can by will include the first fibrous layer of the first fiber with can comprising heat Molten second fiber and the second fibrous layer lamination with the MD shrinking percentage lower by more than 5% than the MD shrinking percentages of the first fibrous layer, By the entanglement between the first fiber being contained in the first fibrous layer and the second fiber being contained in the second fibrous layer and one Two layers of bodyization shrink the first fibrous layer to form structure that the second fibrous layer swells in a thickness direction and from second Fibrous layer side partly bonds processing to manufacture using sound wave.
Specifically, Stretchable bulky nonwoven fabric of the invention includes the first fiber of the first fiber for example, by integration Layer and the second fibrous layer (non-woven fabrics is formed) comprising fusible second fiber of heat, make the first fibrous layer shrink and (shrink processing) and Then sound wave bonding processing is partly applied from the second fibrous layer side and obtain.
(non-woven fabrics forms and shrinks processing)
The present invention Stretchable bulky nonwoven fabric by non-woven fabrics apply sound wave bonding processing, wherein the first fibrous layer with Second fibrous layer and integration and makes the first fibrous layer shrink to form second by the entanglement between the fiber in two layers Structure that fibrous layer swells in a thickness direction and obtain.
In integrated first fibrous layer and the second fibrous layer (non-woven fabrics is formed) and the contraction of the first fibrous layer is made (to shrink and add Work) after, two layers can be by the entanglement between the fiber in two layers and integration, and can then make the first fibrous layer It shrinks and forms and shrink processing to swell the second fibrous layer or non-woven fabrics in a thickness direction and can be carried out at the same time.
Specifically, for example, fiber is processed to the fabric with 100 grams/m of Unit Weight.When fabric is drying In case at 120 DEG C through heat-treated 5 minutes when, show helix-coil.Therefore, using with 40% or more than 40%, it is more excellent Select 50% or the MD shrinking percentages more than 50%, more preferable 65% or more than 65% fiber it is fine as first in the first fibrous layer Dimension.If showing grade or the greater degree of helix-coil in the first fiber by increasing the temperature to carry out contraction processing, The first fiber around interface between so the first fibrous layer and the second fibrous layer shows helix-coil and shrinks so that the Fiber in two fibrous layers tangles around same interface.Therefore, the first fiber in the first fibrous layer is contained in being contained in The second fiber in second fibrous layer effectively tangles on the thickness direction of two layers at subregion, wherein the part Around the interface of region between the two layers.More specifically, non-woven fabrics forms the (one of the first fibrous layer and the second fibrous layer Change process) and shrink processing be according to method as described above simultaneously realization.Therefore, the course of work can significantly obtain letter Change without individually carrying out each process.
Therefore, the first fibrous layer and the second fibrous layer are laminated and by the entanglement between the fiber in two layers and one Body.However, from the viewpoint of two layer layerings are especially prevented, the contact point of the fiber in two layers preferably passes through heat fusion The hot fusible fibers in the second fibrous layer are contained in portion-form bonding of tangling.In order to realize this bonding, shrinking processing can Showing the second fiber of helix-coil and the second fibrous layer with the first fiber in the first fibrous layer leads to the temperature being hot-melted Degree is lower to carry out.
Specifically, the first fibrous layer comprising the first fiber be formed as lower floor and comprising fusible second fiber of heat the Two fibrous layers are formed as upper strata, and the first fibrous layer is laminated and heats with the second fibrous layer.Therefore, the contraction of lower floor and The formation of the non-woven fabrics of upper strata and lower floor may be performed simultaneously.It is preferred that this method.
Herein, because the second fibrous layer comprising the second fiber is formed as upper strata, therefore second comprising the second fiber is fine Dimension layer can be formed as the layer contactless with hot-working machine (such as drying machine), therefore shrink and process and can satisfactorily carry out. Interface between upper strata and lower floor, lower floor shows while upper strata bonds at random with lower floor during being processed by heat shrink It writes and shrinks, the fibre matting in interface, therefore form non-woven fabrics.
For shrink process, this drying machine can with pin tentering drying machine (pin tenter dryer), for drying Contraction drying machine (shrink dryer), floatation type drying machine (floating dryer), the horizontal drum of towel, cloth etc. are done Dry machine (horizontal drum dryer), countercurrent drier (convection dryer) (oven) form use.In drying In machine type, it is preferably widely used for the conveying-type drying machine (conveyer dryer) according to the non-woven fabrics of carding process.It is logical Hot-air often is used as heating system, but can allow to contact to heat by steam, infrared light, microwave or heating roller.
When using hot-air as heating system, heating interval is generally preferably in the range of 3 seconds to 10 seconds, and wind speed It can usually be adjusted in the range of 0.8 meter per second to 1.4 meter per seconds, but condition is not limited to this.
By integrated first fibrous layer and the second fibrous layer (non-woven fabrics is formed) and the first fibrous layer is made to shrink (contraction Processing) Stretchable bulky nonwoven fabric that is obtained has wherein the second fibrous layer being contracted between entanglement by the first fibrous layer The structure swelled in a thickness direction.
Protuberance is since the first fiber shows helix-coil and is showed with intensive and irregular mode.The protuberance is different from Described in patent document the 2nd, such as by by means of roller platen (have regular imprinted pattern) can not high shrinkage fabric with Collapsible homofil fabric portions heat pressure adhesive and allow to make section between related impression partial to be heat-shrinked what is obtained Protuberance.
Such as it is different from according to the non-woven fabrics of carding process, the second fibrous layer in the present invention is in bump in non-woven fabrics Thickness direction on enhancing arrangement fiber and with compared with high-loft and excellent properties.
(sound wave bonding processing)
The Stretchable bulky nonwoven fabric of the present invention is by laterally having what wherein the second fibrous layer swelled from the second fibrous layer The non-woven fabrics of structure is partly applied sound wave bonding processing and is obtained.
Sound wave bonding processing is also referred to as ultrasonic welding processing.Sound wave bonding processing is to apply to have about 15 kilo hertzs to component The processing method for being thermally bonded the component to friction obtained by the ultrasonic wave vibration and pressure of about 50 kilo hertzs of frequency and use. The open known device usually used in the Stretchable bulky nonwoven fabric of the manufacture present invention for binder fibre layer purpose and its Condition can be applied suitably, and be not particularly limited.
Sound wave is bonded and is processed, pocket Supersonic wave solder can be used, and can industrially use comprising a pair The equipment of pattern roller and ultrasonic horn (ultrasonic horn).Including a pair of of pattern roller and ultrasonic loudspeaker In the equipment of shape radiator, non-woven fabrics is melted and is glued by the ultrasonic wave vibration generated from ultrasonic horn It closes.Ultrasonic from ultrasonic horn only with the protrusion partial resonance of pairs of pattern roller and it is strong to non-woven fabrics Ground provides ultrasonic wave vibration.Therefore, the non-woven fabrics in the recess of pattern roller does not melt and can keep fluffy degree on the contrary.Cause This, sound wave stick portion is partly formed on fibrous layer.
Sound wave bonding processing in, compared with hot padding, significantly more formed heat bonding part and non-thermally bonded part it Between boundary.During the Stretchable bulky nonwoven fabric of the manufacture present invention, two layers only pass through becoming entangled between fiber It is integrated at contact interface between first fibrous layer and the second fibrous layer, and the second fibrous layer is fine second between entanglement Dimension layer swells on side, therefore the fiber in the second fibrous layer swelled has the higher arrangement towards the thickness direction of non-woven fabrics Matter.
Therefore, it is if grand in a thickness direction between entanglement with wherein the second fibrous layer from direction on the second fibrous layer The non-woven fabrics of the structure risen partly applies sound wave bonding processing, then is arranged on " length " direction of non-woven fabrics with fiber Situation is compared, in non-ultrasonic irradiated site and the ultrasonic irradiated site of the melting of wherein non-woven fabrics and nonwoven thickness reduction Between significantly more show boundary.More specifically, the pattern institute wherein using stick portion and non-adhesive portion can be obtained The layout of formation significantly visible Stretchable bulky nonwoven fabric.
On the other hand, if non-embossed position is being applied hot padding after-contraction and swelled in advance, then non-embossed position From the boundary with impression partial, gradually protuberance forms dome-shaped protuberance.In the design drawing showed by stick portion and non-adhesive portion In case, the shape of initial designs pattern cannot accurately reproduce, and cannot produce such as the layout of the non-woven fabrics of the present invention The raw profile with notable clarity.
The pattern (ridge) of pattern roller in sound wave bonding processing is not particularly limited.Particular instance includes round, water chestnut Shape or rectangular patterns or image.In types of patterns, preferably such as round and diamond shape dot pattern dot pattern to obtain retractility And fluffy degree.In addition, the arrangement of the pattern (ridge) of pattern roller is preferably staggered.
The pattern (ridge) of pattern roller generates the recess portion of Stretchable bulky nonwoven fabric, i.e. its stick portion.Therefore, it bonds Partial increase is tended to reduce retractility.Therefore, the area of the recess portion (stick portion) in entire Stretchable bulky nonwoven fabric Than preferably in the range of 3% to 60%, more preferably in the range of 10% to 30%.If the area ratio of recess portion is 3% to 60% In the range of, then retractility becomes advantageous and preferred this area ratio.
In addition, statement " partly bonds processing (partially applying the sonic bond using sound wave Processing) " mean to be less than in the range of 100%, preferably 3% to 60%, the face in the range of more preferable 10% to 30% Product ratio forms recess portion.
In sound wave bonding processing, a certain amount of ultrasonic wave vibration for being provided to Stretchable bulky nonwoven fabric can be by from super The ultrasonic power that sound wave horn generates controls.Therefore, the ultrasonic wave vibration provided with high power exceedingly melts Melt the recess portion of Stretchable bulky nonwoven fabric and the recess portion that melts away completely, and be also possible to open corresponding to the position of recess portion and be formed Hole.Therefore, can effectively manufacture with splendid retractility, good tactile, compared with high-loft and retractility with hole it is fluffy Loose non-woven fabrics.
Stretchable bulky nonwoven fabric
In the Stretchable bulky nonwoven fabric of the present invention, the first fibrous layer and the second fibrous layer are by being contained in the first fiber Layer in fiber and the fiber being contained in the second fibrous layer between entanglement and it is integrated.Herein, statement is " by tangling and one Body (integrated by the entanglement) " refer to the fiber being wherein contained in the first fibrous layer with comprising Fiber in the second fibrous layer is entangled with one another and two integrated situations of layer.Statement passes through heat not comprising wherein fibrous layer Pressure viscosity close processing (such as hot padding) and integrated embodiment.
Preferably, in the Stretchable bulky nonwoven fabric of the present invention, the first fiber and packet that are contained in the first fibrous layer It tangles at subregion in a thickness direction contained in the second fiber in the second fibrous layer.That means two kinds of fibers in nonwoven It tangles interface on the thickness direction of cloth between the two layers.More specifically, with being wherein contained in the first fibrous layer Fiber preferably includes compared with the situation that the fiber being contained in the second fibrous layer tangles in the whole thickness of non-woven fabrics Fiber in two layers partly tangles, i.e., interface between the two layers is tangled.
Therefore, the influence in layers caused by the fiber in other layers is limited in part of horizontal, and easily opens up The now efficiency caused by the fiber for initially forming each layer.
In addition, " interface (interface) " as described above mean wherein the first fibrous layer and the second fibrous layer that The boundary of this contact.Herein, using term " interface " to express wherein the first fibrous layer with the second fibrous layer by respectively constituting The situation that entanglement between the fiber of each layer and integration but fiber not exclusively mix each other.
In the Stretchable bulky nonwoven fabric of the present invention, the second fibrous layer has lower than the MD shrinking percentages of the first fibrous layer More than 5% MD shrinking percentages, and the first fibrous layer shrinks to form the structure that the second fibrous layer swells in a thickness direction.It is former Because being, if the MD shrinking percentages difference between the first fibrous layer and the second fibrous layer is less than 5%, then wherein second cannot be obtained Fibrous layer is swelled on the second fibrous layer side between corresponding tangling portion point and is folded not on the traffic direction in non-woven fabrics Regular foldable structure.
In the Stretchable bulky nonwoven fabric of the present invention, two layers are only by the entanglement between fiber and in the first fibrous layer It is integrated at contact interface between the second fibrous layer, the first fibrous layer shrink and the second fibrous layer between entanglement the It is swelled on two fibrous layer sides.Therefore, the fiber in the second fibrous layer of protuberance has the higher row towards the thickness direction of non-woven fabrics Row property.
Therefore, sound wave bonding processing is partly applied from the second fibrous layer side.Therefore, compared with hot padding, significantly more The boundary between heat bonding part and non-thermally bonded part is formed, and forms the pattern using stick portion and non-adhesive portion The layout formed significantly visible Stretchable bulky nonwoven fabric.
The Stretchable bulky nonwoven fabric of the present invention is partly subjected to sound wave bonding processing, and preferably comprises and glued by sound wave Close the position for processing formed recess portion and not being subjected to sound wave bonding processing.In addition, the area ratio of recess portion is less than 100%, preferably In the range of 3% to 60%, more preferably in the range of 10% to 30%.
By the thickness of the formed protrusion of sound wave bonding processing preferably in the range of 1.0 millimeters to 5.0 millimeters, more preferably In the range of 1.5 millimeters to 3.5 millimeters.When the thickness of protrusion is 1.0 millimeters or during more than 1.0 millimeters, retractility of the invention Loft non-woven cloth has compared with high-loft and splendid tactile.In addition, when the thickness of protrusion is 5.0 millimeters or during less than 5.0 millimeters, The Stretchable bulky nonwoven fabric of the present invention has splendid flexibility (flexibility).
It is preferably excessively melted by the formed recess portion of sound wave bonding processing and removes the portion for the thickness to form recess portion Position and lead in non-woven fabrics.Therefore, it can manufacture with compared with high-loft, splendid retractility and splendid tactile and with hole Stretchable bulky nonwoven fabric.
Those of ordinary skill in the art show and are apparent from, can in the case of without departing substantially from the spirit or scope of the present invention, Numerous modifications and variations are carried out in particular instance of the invention and mentioned herein.Therefore, it is intended that the present invention is covered in any power The modifications and variations of the present invention in the range of profit requirement and its equivalent.
Following instance is merely for illustrative purpose and is not intended to also should not be construed and limits the scope of the invention.
Example
Hereinafter, the present invention will be described in more detail by example, but the present invention is never limited to the example.
Resin
1 polypropylene homopolymer of resin：Fusing point is 160 DEG C, melt mass flow rate { experimental condition M, JIS K7210 (1999) } it is 15 grams/10 minutes.
2 ethylene-propylene copolymer of resin：Ethylene contents are 4 mass %, and fusing point is 130 DEG C, and melt mass flow speed Rate { experimental condition M, JIS K7210 (1999) } is 16 grams/10 minutes.
Resin 3LDPE：The Petrothene 350 (trade (brand) name) manufactured by Tosoh company (Tosoh Corporation), Fusing point is 105 DEG C, and melt mass flow rate { experimental condition D, JIS K7210 (1999) } is 23 grams/10 minutes.
Elastomer of the resin 4 based on alkene：The ENGAGE 8402 (trade (brand) name) manufactured by Dow Chemical, fusing point are 100 DEG C, melt mass flow rate { experimental condition D, JIS K7210 (1999) } is 20 grams/10 minutes.
5 high density polyethylene (HDPE) of resin (HDPE)：By Jing Ye polyethylene Co., Ltd (Keiyo Polyethylene Co., Ltd.) the S6900 (trade (brand) name) of manufacture, fusing point is 130 DEG C, and melt mass flow rate { experimental condition D, JIS K7210 (1999) } it is 16 grams/10 minutes.
Fiber
First fiber is the potential rollable fusible conjugate fiber of heat, poly- comprising 2 ethylene-propylene copolymer of resin and resin 1 Noblen, and with side-by-side cross-section (mass ratio：50/50), the fineness of 2.2 dtexs and 51 millimeters of fibre length. The MD shrinking percentages of first fiber are 73.5%.
Fiber 2A is the potential rollable fusible conjugate fiber of heat, comprising 1 polypropylene homopolymer of resin 3LDPE and resin, and And with side-by-side cross-section (mass ratio：50/50), the fineness of 2.2 dtexs and 51 millimeters of fibre length.The MD of fiber 2A is shunk Rate is 20.5%.
Can not high shrinkage 2B-1 be the fusible conjugate fiber of heat, there is concentric sheath core cross section (mass ratio：50/50), Middle elastomer resin of the resin 4 based on alkene is arranged in sheath, and 1 polypropylene homopolymer of resin is arranged in core, and have There are the fineness and 51 millimeters of fibre length of 2.2 dtexs.The MD shrinking percentages of fiber 2B-1 are 1.3%.
Can not high shrinkage 2B-2 be the fusible conjugate fiber of heat, there is concentric sheath core cross section (mass ratio：50/50), Middle resin 5HDPE is arranged in sheath, and 1 polypropylene homopolymer of resin is arranged in core, and with 2.2 dtexs fineness and 51 millimeters of fibre length.The MD shrinking percentages of fiber 2B-2 are 0.3%.
Prepare laminated fiber layer
By using the miniature combing by the manufacture of big and Ji Gong Co., Ltds (Daiwa-kiko corporation Ltd.) Fiber of the machine described in fiber column prepares the fibrous layer with 10 grams/m of Unit Weights.Then, by by fiber 2A or Can not high shrinkage 2B be laminated on the first fibrous layer comprising the first fiber and prepare the layer with 20 grams/m of Unit Weights Press fibrous layer.
It shrinks processing and non-woven fabrics is formed
By making to prepare the laminated fiber layer obtained in laminated fiber layer in 125 DEG C of hot air temperatures, 0.5 meter per second wind By hot-air cycle heat treatment machine under speed, 12.5 ms/min of conveyor speeds and the processing conditions of 3 seconds, non-woven fabrics is obtained.
Sound wave bonding processing
It is manufactured by using by Jing electricity She Electronics Industries Ltds (Seidensha Electronics Co., Ltd.) Supersonic wave solder (Sonopet-150K) with 15% ultrasonic horn power (maximum power：150 watts, oscillation Frequency：48.5 kilo hertzs) to non-woven fabrics apply ultrasonic 0.4 second, carry out sound wave bonding processing.
Hot padding
In 115 DEG C of processing temperatures, 6 ms/min of process velocities, 20 kg/cm of line pressures and 0.01 millimeter of gap Hot padding is carried out under processing conditions.
Measure thickness
By means of there is the pressure applicator of 35 mm dias (load) to being cut to 15 cm x, 15 cm size bar Non-woven fabrics apply 343.2 pas (3.5 grams/cm) pressure.Using by Jing Qi Co., Ltds of Japan (Toyo Seiki Co., Ltd.) manufacture digital thickness tester (Digithickness Tester) measure apply pressure at thickness.
Measure the shrinking percentage of fibrous layer (woven)
Using the miniature carding machine by the manufacture of big and Ji Gong Co., Ltds, and by the initial of 100 grams of openings to be used Fiber is introduced into 30 cm widths being introduced into the central part of conveyer of carding machine, and using with 145 centimetres of perimeters Reel (winding drum) the doffer speed (doffer speed) of 7.0+/- 0.2 m/min and 7.3+/- 0.2 meter/ Total amount fiber is wound under the speed of minute, winding fiber is cut off, therefore obtain with about 25 cm x by using scissors etc. The fibrous layer of about 25 cm sizes.
Between fibrous layer with about 25 cm size of about 25 cm x is clipped in the ox-hide scraps of paper, and by using by three Foreign Electric Applicance Co., Ltd (SANYO Electric Co., Ltd.) manufactures and is set in 120 DEG C of 5 points of countercurrent drier processing Clock, and fibrous layer is subsequently removed out, and measure MD length and the MD of fibrous layer is calculated according to equation as described below Shrinking percentage.
The MD shrinking percentages of fibrous layer={ length (cm) after length (cm)-heat treatment before heat treatment }/{ before heat treatment Length (cm) } × 100 (%).
Measure the shrinking percentage of lamination fibrous layer
The laminated fiber layer prepared obtained in laminated fiber layer as described above is cut on MD 1,000 millimeters simultaneously And 300 millimeters on CD, shrink processing and non-woven fabrics formed described under conditions of be heat-treated, measure MD length a and CD length b, and shrinking percentage is measured according to equation as described below.
MD shrinking percentages (%)={ 1,000- length a }/1,000 × 100.
CD shrinking percentages (%)={ 300- length b }/300 × 100.
Measure tensile strength
Use " the autoplotter AG500D manufactured by Shimadzu Seisakusho Ltd. (Shimadzu Corporation) (Autograph AG500D)”.Sample length of the sample from 100 millimeters is being extended 50% with 100 ms/min of test speed Later, sample is made to return to the length of sample length, and then measures the load of 50% period of elongation sample again.Initially stretching It is 10%, 20%, 30%, 40% and 50% to grow (first time) and restart to extend two point in time measurement elongations (for the second time) Intensity, and by regard intensity as the longitudinal axis and tension as horizontal axis come map (S-S curves).
When initial elongation load and restart elongation when load between difference bigger when, judge retractility more It is low.In addition, when extending the gradient higher in load diagram, judge that flexibility is lower and tactile is poor.
The observed result of the structure of non-woven fabrics
Substantially longitudinal cutting non-woven fabrics, and the digital microscope by means of being manufactured by Keyemce company (VHX-900) It observes cross section and observes state of entanglement and heat bonding between the state of the fibrous layer of each composition, fiber etc..
Example 1
It prepares the fibrous layer comprising the first fiber all as described in fiber above and includes the fibrous layer of fiber 2A, and It is laminated to prepare laminated fiber layer, and non-woven fabrics is prepared under conditions of shrinking described in processing and non-woven fabrics formation. First fiber shows the helix-coil significantly shunk, and fiber 2A shows the helix-coil shunk on a small quantity.
The fiber of non-woven fabrics is formed partly to twine at the laminate interface on the thickness direction of non-woven fabrics between the two layers Knot, and the second fibrous layer comprising fiber 2A swells between entanglement on the second fibrous layer side.First fiber used is each other It will not be thermally bonded, and the contact point between contact point between fiber 2A used and fiber 2A and the first fiber is by making fiber 2A is hot-melted and bonds.The thickness of non-woven fabrics is 3.2 millimeters.
Under conditions of described in sound wave bonding processing above, by using setting for the dot pattern with 3 mm dias It counts and applies ultrasonic to have in the form of being staggered of 5 millimeters of spacing and weld, obtain Stretchable bulky nonwoven fabric.
Example 2
The fibrous layer comprising the first fiber all as described in fiber above is prepared respectively and comprising can not high shrinkage 2B- 1 fibrous layer, and be laminated to prepare laminated fiber layer, and shrinking processing and the condition described in non-woven fabrics formation Under prepare non-woven fabrics.First fiber shows the helix-coil significantly shunk, and can not high shrinkage 2B-1 hardly shrink.
The fiber of non-woven fabrics is formed partly to twine at the laminate interface on the thickness direction of non-woven fabrics between the two layers Knot, and the second fibrous layer comprising fiber 2B-1 swells between entanglement on the second fibrous layer side.First fiber used that This will not be thermally bonded, and contact point that can not be between high shrinkage 2B-1 used with can not high shrinkage 2B-1 and the first fiber Between contact point by be hot-melted can not high shrinkage 2B-1 bond.The thickness of non-woven fabrics is 2.6 millimeters.
Under conditions of described in sound wave bonding processing above, by using setting for the dot pattern with 3 mm dias It counts and applies ultrasonic to have in the form of being staggered of 5 millimeters of spacing and weld, obtain Stretchable bulky nonwoven fabric.
Example 3
It prepares the fibrous layer comprising the first fiber all as described in fiber above and includes the fibrous layer of fiber 2A, and It is laminated to prepare laminated fiber layer, and non-woven fabrics is prepared under conditions of shrinking described in processing and non-woven fabrics formation. First fiber shows the helix-coil significantly shunk, and can not high shrinkage 2A show the helix-coil of faint contraction.
The fiber of non-woven fabrics is formed partly to twine at the laminate interface on the thickness direction of non-woven fabrics between the two layers Knot, and the second fibrous layer comprising fiber 2A swells between entanglement on the second fibrous layer side.First fiber used is each other It will not be thermally bonded, and the contact point between contact point between fiber 2A used and fiber 2A and the first fiber is by making fiber 2A is hot-melted and bonds.The thickness of non-woven fabrics is 3.2 millimeters.
Under conditions of described in sound wave above bonding processing, by by the ultrasonic power period become 1 second, using with The design of the dot pattern of 3 mm dias and ultrasonic is applied in the form of being staggered of 5 millimeters of spacing weld with mistake to have The position of degree ground melting design melts position and leads in non-woven fabrics completely, so as to obtain Stretchable bulky nonwoven fabric.
Comparative example 1
It prepares the fibrous layer comprising the first fiber all as described in fiber above and includes the fibrous layer of fiber 2A, and It is laminated to prepare laminated fiber layer, and non-woven fabrics is prepared under conditions of shrinking described in processing and non-woven fabrics formation. The thickness of non-woven fabrics is 3.2 millimeters.
Then, under conditions of described in sound wave bonding processing above, by using the dot chart with 0.8 mm dia The design of case and ridge with 0.5 millimeter of general height, and to have application in the form of being staggered of 5 millimeters of spacing hot Coining, so as to obtain non-woven fabrics.
Comparative example 2
Prepare the fibrous layer comprising the first fiber all as described in fiber above and comprising can not be high shrinkage 2B-2 Fibrous layer, and be laminated to prepare laminated fiber layer.
Then, under conditions of described in sound wave bonding processing above, by the way that processing temperature is become 124 DEG C, using tool There is the design of the dot pattern of 0.8 mm dia and the ridge with 0.5 millimeter of general height, and to have between 5 millimeters Away from the form that is staggered using hot padding, so as to obtain non-woven fabrics.
Then, contraction processing is carried out under conditions of shrinking described in processing and non-woven fabrics formation.The non-woven fabrics obtained Thickness be 1.3 millimeters.
Table 1 shows example and the shrinking percentage of laminated fiber layer in comparative example and the tensile strength of non-woven fabrics and thickness Result.
Table 1
As shown in table 1, it is as real in arrived by the obtained example 1 of contraction processing, non-woven fabrics formation and sound wave bonding processing Non-woven fabrics in example 3 is respectively provided with 3.0 millimeters, 2.3 millimeters and 2.8 millimeters of thickness, and with comparative example 1 and compared with Non-woven fabrics in example 2 compares higher thickness.Therefore, the non-woven fabrics in example 1 to 3 has compared with high-loft and well touches Feel, and show satisfactory retractility.
Specifically, the non-woven fabrics in example 1 has high shrinkage and compared with high-loft, this is because being rolled up potential The bent fusible conjugate fiber of heat is used for the second fibrous layer.In addition, non-woven fabrics in example 2 has splendid tensile strength and higher flexible Property, this is because elastomer resin is used for the second fibrous layer.
On the other hand, as by non-woven fabrics formed and the comparative example 1 that is obtained of hot padding in non-woven fabrics have as low as 0.4 millimeter of thickness, and fiber bonds, and show no retractility completely due to the influence of coining roll temperature.
In addition, according to the non-woven fabrics such as processed by hot padding and contraction in obtained comparative example 2, between connection Section is protruded, and cannot obtain abundant fluffy degree, and the section between fiber when being shunk between imprinting coupling part It is bonded completely, and observe the non-woven fabrics with extremely low retractility due to the influence of coining roll temperature.
Although being described under a degree of particularity and illustrating the present invention, it is to be understood that the present invention only passes through Example generates, and can be by those of ordinary skill in the art without departing from the spirit and scope of the present invention to condition Numerous variations are taken with order of steps.
Industrial feasibility
The Stretchable bulky nonwoven fabric of the present invention has splendid retractility, compared with high-loft and good tactile.Therefore, this hair Bright Stretchable bulky nonwoven fabric can be used for surfacing (such as absorbing articles) or the second layer in such as hygiene article sector And the female material (female material) of the magic tape (hook and loop fastener) in industrial materials field.

Claims (3)

1. a kind of Stretchable bulky nonwoven fabric, which is characterized in that the first fibrous layer comprising the first fiber with comprising heat it is fusible Second fiber and the with the machine direction shrinking percentage lower by more than 5% than the machine direction shrinking percentage of first fibrous layer Two fibrous layers are laminated, first fibrous layer and second fibrous layer by be contained in first fibrous layer described the One fiber and the entanglement of thermal contraction that is contained between second fiber in second fibrous layer and it is integrated, in described In the entanglement of thermal contraction, first fiber of first fibrous layer is helically curly and first fibrous layer it is described The contact point of first fiber and second fiber of second fibrous layer is to be contained in second fiber by heat fusion The form bonding of fusible second fiber of heat in layer, and be contained in first fiber in first fibrous layer with Second fiber in second fibrous layer is contained on the thickness direction of the non-woven fabrics in first fibrous layer Interface between second fibrous layer is partly tangled, and first fibrous layer shrinks to form second fibrous layer The structure swelled in a thickness direction and sound wave bonding processing is partly applied from the second fibrous layer side to form recess portion And the protrusion that the position by not being subjected to sound wave bonding processing is formed, wherein the thickness of the protrusion is at 1.0 millimeters to 5.0 millis In the range of rice.
2. Stretchable bulky nonwoven fabric according to claim 1, which is characterized in that have and the recess portion is formed by removal Thickness the hole that is obtained of position.
3. a kind of manufacturing method of Stretchable bulky nonwoven fabric, which is characterized in that including：
By the first fibrous layer comprising the first fiber and comprising the second fusible fiber of heat and with than first fibrous layer Machine direction shrinking percentage low more than 5% machine direction shrinking percentage the second fibrous layer lamination；
Pass through first fiber that is contained in first fibrous layer and be contained in second fibrous layer described the The entanglement of thermal contraction between two fibers and integration first fibrous layer and second fibrous layer, and in the thermal contraction Entanglement in, first fiber of first fibrous layer is helically curly and described the first of first fibrous layer is fine The contact point of dimension and second fiber of second fibrous layer is contained in second fibrous layer by heat fusion The form bonding for second fiber that heat is fusible；
First fibrous layer is made to shrink to form the structure that second fibrous layer swells in a thickness direction；And
Sound wave bonding processing is partly applied from the second fibrous layer side to form recess portion and be added by not being subjected to sound wave bonding The protrusion that the position of work is formed, wherein the thickness of the protrusion is in the range of 1.0 millimeters to 5.0 millimeters.
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